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1. #Bandmaster ab763 schematic mod#
2. #Bandmaster ab763 schematic manual#
3. #Bandmaster ab763 schematic pro#
4. #Bandmaster ab763 schematic download#

Nothing fancy, just off the shelf GrooveTubes.

Haven’t disconnected them from the circuit, but impedance at 0 and impedance at 10 are different on both, but I’m currently attributing that to the fact that they’re still wired into the circuit.Īny suggestions before really tearing into this thing and violating the sanctity of it with replacement parts?Īll tubes appear to be pretty new. If you want to contribute, please mail your pdfs to . Bandmaster-amp AB763 Ampl/Mixer Fender Electric Instrument Co.

#Bandmaster ab763 schematic manual#

5 on vibrato (both input 1) is a fair bit quieter on normal. This is the 2 pages manual for fender bandmaster ab763 schematic. My question/concern is that the normal channel’s volume relative to the vibrato channel is quiet. The solder on the flat ones is less oxidized than the others. Some have the dimpled/domed back case, some are flat like every modern pot I’ve seen. Looks like some pots have maybe been replaced. Haven’t determined if the transformers are original. Wiring looks to be all original minus a grounded power cord. The main differences between these amps are transformer size, filter caps size and output/speaker impedance.

#Bandmaster ab763 schematic pro#

These simple mods are completly reversable.I recently acquired a beautiful new to me 67-68 Fender Bandmaster head and cab combo. The silverface Bandmaster Reverb is a typical ab763 amp and shares basic circuit design with the Super Reverb, Deluxe Reverb, Twin Reverb, Vibrolux Reverb, Pro Reverb and Twin Reverb. The picture below shows the additional "sag" power resistor. Home » Fenderbandmasterab763schem Fenderbandmasterab763schem. With three resisors, the Silverface Bandy is much more touch sensitive and responsive. At idle, there is a 7 volt drop across the resistor.

A terminal strip was added to mount the resistor in a way that would allow cooling air around it. The signal path of all AB763 amps will be very similar to the schematic above and layout diagram below. I lifted the red lead from the rectifier diodes feedding to the main filter caps. Closest I had on hand was a 10 watt, 100 ohm resistor. Rob's site suggested a 62 ohm resistor to simulate a GZ34 rectifier. But taking an idea from, I simulated tube rectifier sag with a resistor. List your Fender Black Panel Bandmaster 40-Watt 2-Channel 2x12' Piggyback Guitar Amp 1963 - 1967 today to get it in front of thousands of eyes, quickly and easily. Interest-free available, starting at 116/month. More complicated would be a tube rectifier. Fender Bandmaster AB763 Head and 2x12 Cabinet 1965. Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 10 inch 25.4 cm. 57 Precision Bass VintageSeries (US1983) owners manual. Click on the schematic thumbnail to request the schematic as a free document.

#Bandmaster ab763 schematic download#

'50s Stratocaster 013-1002 Service manual. Download Fender BANDMASTER AB763 Fender BANDMASTER AB 763 Guitar Amp Schematic Car wirings and schematics,automobile documentation, auto repair guides,car audio manuals. Lowering the preamp and PI tube supply voltages gave the amp a less strident voice that was more bluesy but still classic Fender. 50th Anniversary Golden Stratocaster 013-2004-378 Service manual. The model name Bandmaster covered various circuits, not at all equivalent. I changed the Bandmaster 1K 1W and 4.7K 1W power supply resistors to 10K 1W resistors. Similar to the AB763 Bandmaster circuit is the AA763 Tremolux.

#Bandmaster ab763 schematic mod#

Hesitant to heavily mod a vintage amp, I studied similar AB763 and AA763 schematics for some ideas to get me close to the tone I missed in my old amps. It is very loud through a vintage styled 2X12. The cranked sound of the Silverface Bandmaster I would describe as slightly strident, crunchy and yet Marshall like. It still has the original carbon comp resistors and blue Ajax capacitors. After replacement of the electrolytic capacitors, installation of all American made tubes and a bias adjustment, it is a great sounding Bandmaster. Today, my Bandmaster is an early 1967 Silverface drip edge that is one of the last Blackface Bandmasters inside. They were great for the Led Zeppeling flavored blues rock that I played back then but now they're gone. Back in the 70's, I owned a Brownface 6G7-A Bandmaster.